Teradata中有一个系统表，我可以在其中找到列类型的全名？
我使用的是Teradata 14.10，在表Teradata中有一个系统表，我可以在其中找到列类型的全名？,teradata,Teradata,我使用的是Teradata 14.10，在表DBC.Columns和DBC.ColumnsVX中，我没有找到包含字段ColumnTypes中使用的数据类型全名的系统表 我在这里找到了从ColumnTypes代码到其全名的映射，但我不希望手动进行映射。我不知道DBC中有任何表包含此信息，但您可以在Teradata文档中找到此信息（也许可以将其加载到您自己的表中） SELECT trim(ColumnName) || case columnType when 'CV' then '
DBC.ColumnsDBC.ColumnsVXColumnTypes我在这里找到了从ColumnTypes代码到其全名的映射，但我不希望手动进行映射。我不知道DBC中有任何表包含此信息，但您可以在Teradata文档中找到此信息（也许可以将其加载到您自己的表中）
SELECT
trim(ColumnName) ||
case columnType
when 'CV' then ' varchar(' || trim(ColumnLength) || ') '
when 'DA' then ' date '
when 'F' then ' float '
when 'N' then ' number '
when 'D' then ' decimal(' || trim(DecimalTotalDigits) || ',' || trim(DecimalFractionalDigits) || ') '
when 'TS' then ' timestamp( ' || trim(ColumnLength) || ') '
when 'AT' then ' time '
when 'CF' then ' char(' || trim(ColumnLength) || ') '
end ColumnDef
FROM DBC.columns s1
WHERE databasename='$database' and tablename='$table';
我没有检查向后兼容性，但它几乎肯定是向后兼容的（没有理由不应该这样）。同一文档包含大量关于DBC对象中可能值的许多其他有用信息。没有正式的表，但可以通过中提供的映射轻松创建它（这就是复制DevEx链接中的列表的地方） 但我更喜欢使用简单的SQL UDF来进行映射，因为可能值的列表非常稳定（在新的TD版本中，您可能需要插入新行或添加新的WHEN条件）：
Value Description
----------------------------------------------------------
++ TD_ANYTYPE
A1 One dimensional ARRAY data type
AT ANSI Time
BF BYTE Fixed
BO Byte Large Object
REPLACE FUNCTION Datatype
(
ColumnType CHAR(2)
)
RETURNS VARCHAR(60)
LANGUAGE SQL
CONTAINS SQL
DETERMINISTIC
SQL SECURITY DEFINER
COLLATION INVOKER
INLINE TYPE 1
RETURN
CASE ColumnType
WHEN 'BF' THEN 'BYTE'
WHEN 'BV' THEN 'VARBYTE'
WHEN 'CF' THEN 'CHAR'
WHEN 'CV' THEN 'VARCHAR'
WHEN 'D ' THEN 'DECIMAL'
WHEN 'DA' THEN 'DATE'
WHEN 'F ' THEN 'FLOAT'
WHEN 'I1' THEN 'BYTEINT'
WHEN 'I2' THEN 'SMALLINT'
WHEN 'I8' THEN 'BIGINT'
WHEN 'I ' THEN 'INTEGER'
WHEN 'AT' THEN 'TIME'
WHEN 'TS' THEN 'TIMESTAMP'
WHEN 'TZ' THEN 'TIME WITH TIME ZONE'
WHEN 'SZ' THEN 'TIMESTAMP WITH TIME ZONE'
WHEN 'YR' THEN 'INTERVAL YEAR'
WHEN 'YM' THEN 'INTERVAL YEAR TO MONTH'
WHEN 'MO' THEN 'INTERVAL MONTH'
WHEN 'DY' THEN 'INTERVAL DAY'
WHEN 'DH' THEN 'INTERVAL DAY TO HOUR'
WHEN 'DM' THEN 'INTERVAL DAY TO MINUTE'
WHEN 'DS' THEN 'INTERVAL DAY TO SECOND'
WHEN 'HR' THEN 'INTERVAL HOUR'
WHEN 'HM' THEN 'INTERVAL HOUR TO MINUTE'
WHEN 'HS' THEN 'INTERVAL HOUR TO SECOND'
WHEN 'MI' THEN 'INTERVAL MINUTE'
WHEN 'MS' THEN 'INTERVAL MINUTE TO SECOND'
WHEN 'SC' THEN 'INTERVAL SECOND'
WHEN 'BO' THEN 'BLOB'
WHEN 'CO' THEN 'CLOB'
WHEN 'PD' THEN 'PERIOD(DATE)'
WHEN 'PM' THEN 'PERIOD(TIMESTAMP WITH TIME ZONE)'
WHEN 'PS' THEN 'PERIOD(TIMESTAMP)'
WHEN 'PT' THEN 'PERIOD(TIME)'
WHEN 'PZ' THEN 'PERIOD(TIME WITH TIME ZONE)'
WHEN 'UT' THEN 'User Defined Datatype'
WHEN '++' THEN 'TD_ANYTYPE'
WHEN 'N' THEN 'NUMBER'
WHEN 'A1' THEN 'ARRAY'
WHEN 'AN' THEN 'ARRAY (multidimensional'
WHEN 'JN' THEN 'JSON'
WHEN 'VA' THEN 'TD_VALIST'
WHEN 'XM' THEN 'XML'
ELSE '<Unknown> '
END;
/**********
Returns the datatype of a column as a literal
20111012 initial version - Dieter Noeth
20131010 added TD14.10 ARRAY datatypes - dn
20140812 added TD15 JSON / TD_VALIST datatype - dn
**********/
REPLACE FUNCTION DataTypeString
(
ColumnType CHAR(2),
ColumnLength INT,
DecimalTotalDigits SMALLINT,
DecimalFractionalDigits SMALLINT,
CharType SMALLINT,
ColumnUDTName VARCHAR(128) CHARACTER SET UNICODE
)
RETURNS VARCHAR(60)
LANGUAGE SQL
CONTAINS SQL
DETERMINISTIC
SQL SECURITY DEFINER
COLLATION INVOKER
INLINE TYPE 1
RETURN
CASE ColumnType
WHEN 'BF' THEN 'BYTE(' || TRIM(ColumnLength (FORMAT '-(9)9')) || ')'
WHEN 'BV' THEN 'VARBYTE(' || TRIM(ColumnLength (FORMAT 'Z(9)9')) || ')'
WHEN 'CF' THEN 'CHAR(' || TRIM(ColumnLength (FORMAT 'Z(9)9')) || ')'
WHEN 'CV' THEN 'VARCHAR(' || TRIM(ColumnLength (FORMAT 'Z(9)9')) || ')'
WHEN 'D ' THEN 'DECIMAL(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ','
|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'DA' THEN 'DATE'
WHEN 'F ' THEN 'FLOAT'
WHEN 'I1' THEN 'BYTEINT'
WHEN 'I2' THEN 'SMALLINT'
WHEN 'I8' THEN 'BIGINT'
WHEN 'I ' THEN 'INTEGER'
WHEN 'AT' THEN 'TIME(' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'TS' THEN 'TIMESTAMP(' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'TZ' THEN 'TIME(' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')' || ' WITH TIME ZONE'
WHEN 'SZ' THEN 'TIMESTAMP(' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')' || ' WITH TIME ZONE'
WHEN 'YR' THEN 'INTERVAL YEAR(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')'
WHEN 'YM' THEN 'INTERVAL YEAR(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO MONTH'
WHEN 'MO' THEN 'INTERVAL MONTH(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')'
WHEN 'DY' THEN 'INTERVAL DAY(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')'
WHEN 'DH' THEN 'INTERVAL DAY(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO HOUR'
WHEN 'DM' THEN 'INTERVAL DAY(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO MINUTE'
WHEN 'DS' THEN 'INTERVAL DAY(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO SECOND('
|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'HR' THEN 'INTERVAL HOUR(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')'
WHEN 'HM' THEN 'INTERVAL HOUR(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO MINUTE'
WHEN 'HS' THEN 'INTERVAL HOUR(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO SECOND('
|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'MI' THEN 'INTERVAL MINUTE(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')'
WHEN 'MS' THEN 'INTERVAL MINUTE(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ')' || ' TO SECOND('
|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'SC' THEN 'INTERVAL SECOND(' || TRIM(DecimalTotalDigits (FORMAT '-(9)9')) || ','
|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')'
WHEN 'BO' THEN 'BLOB(' || TRIM(ColumnLength (FORMAT 'Z(9)9')) || ')'
WHEN 'CO' THEN 'CLOB(' || TRIM(ColumnLength (FORMAT 'Z(9)9')) || ')'
WHEN 'PD' THEN 'PERIOD(DATE)'
WHEN 'PM' THEN 'PERIOD(TIMESTAMP('|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')' || ' WITH TIME ZONE)'
WHEN 'PS' THEN 'PERIOD(TIMESTAMP('|| TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || '))'
WHEN 'PT' THEN 'PERIOD(TIME(' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || '))'
WHEN 'PZ' THEN 'PERIOD(TIME(' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) || ')' || ' WITH TIME ZONE)'
WHEN 'UT' THEN COALESCE(ColumnUDTName, '<Unknown> ' || ColumnType)
WHEN '++' THEN 'TD_ANYTYPE'
WHEN 'N' THEN 'NUMBER(' || CASE WHEN DecimalTotalDigits = -128 THEN '*' ELSE TRIM(DecimalTotalDigits (FORMAT '-(9)9')) END
|| CASE WHEN DecimalFractionalDigits IN (0, -128) THEN '' ELSE ',' || TRIM(DecimalFractionalDigits (FORMAT '-(9)9')) END
|| ')'
WHEN 'A1' THEN COALESCE('SYSUDTLIB.' || ColumnUDTName, '<Unknown> ' || ColumnType)
WHEN 'AN' THEN COALESCE('SYSUDTLIB.' || ColumnUDTName, '<Unknown> ' || ColumnType)
WHEN 'JN' THEN 'JSON(' || TRIM(ColumnLength (FORMAT 'Z(9)9')) || ')'
WHEN 'VA' THEN 'TD_VALIST'
WHEN 'XM' THEN 'XML'
ELSE '<Unknown> ' || ColumnType
END
|| CASE
WHEN ColumnType IN ('CV', 'CF', 'CO')
THEN CASE CharType
WHEN 1 THEN ' CHARACTER SET LATIN'
WHEN 2 THEN ' CHARACTER SET UNICODE'
WHEN 3 THEN ' CHARACTER SET KANJISJIS'
WHEN 4 THEN ' CHARACTER SET GRAPHIC'
WHEN 5 THEN ' CHARACTER SET KANJI1'
ELSE ''
END
ELSE ''
END
;
SELECT
DatabaseName,
TableName,
ColumnName,
DataTypeString
(ColumnType,
ColumnLength,
DecimalTotalDigits,
DecimalFractionalDigits,
CharType,
ColumnUDTName),
ColumnType,
ColumnLength,
DecimalTotalDigits,
DecimalFractionalDigits,
CharType
FROM dbc.ColumnsV
WHERE ColumnType IS NOT NULL
ORDER BY 4
ORDER BY 1,2,3
;